Burglar-alarm.



VAN J. MILLER.

BURGLAR ALARM! APPLICATION FILED JULY 3. 1915.

L 11 91% Patented May 2, 1916.

5 awe/Mow THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

innit VAN J'. MILLER, OF ST. LOUIS, MISSOURI.

BURGLAIt-ALARM.

Specification of Letters Patent.

Application filed July 3, 1915. Serial No. 37,986.

To all whom it may concern:

Be it known that l, VAN J. MILLER, a citizen of the United States,residing at St. Louis, in the county of St. Louis and State of Missouri,have invented new and useful Improvements in Burglar-Alarms, of whichthe following is a specification.

This invention relates to certain novel and useful improvements inburglar alarm apparatus and has particular application to a mechanicallyoperated burglar alarm.

In carrying out the present invention, it is my purpose to provide aburglar alarm which may be readily connected up with doors and windows,which will be held in inactive position as long as the doors and windowsremain closed, and which will be rendered active immediately upon theopening of one of the doors or windows so as to notify the occupants ofthe premises of the attempted unlawful entry.

It is also my purpose to improve and simplify the general constructionof mecl1anically operated burglar alarm apparatus and to provideapparatus which may be installed and maintained at minimum expense andwhich will operate efiiciently and effectively for its intended purpose.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claim.

In the accompanying drawing, Figure 1 is a plan View of burglar alarmapparatus constructed in accordance with the present invention. Fig. 2is a cross sectional view through the same.

Referring now to the drawing in detail, 1 designates a baseboard.Pivotally secured to the baseboard 1 is a bell 2, a tapper 3 for thebell and a spring motor 4: connected with the tapper and designed toopcrate the same to sound the bell. Secured to the baseboard 1 andspaced apart in parallelism are guide tubes 5 and slidably mountedwithin the guide tubes 5 are the side bars of a substantiallyrectangular frame 6 formed of wire or other suitable material. Formed onone of the end bars of the frame 6 and projecting outwardly therefrom isa finger 7 adapted to enter the path of movement of the tapper 3 to holdthe latter against operation under the action of the motor 4.

Disposed upon the baseboard 1 between Patented May 23, 191E.

the side bars of the frame 6 and lying parallel with one another andwith the side bars of the frame are coiled retractile springs 8 havingthe ends thereof disposed adjacent to the end bar of the frame carryingthe finger 7 fastened to the baseboard by means of screws 9 or the likeand the remaining ends underlying the other end bar of the frame 6 andprojecting outwardly beyond such end bar and curved upon themselves toform hooks 10 equipped with rings 11, respectively. The rings 11 areconnected by means of wires 12 or analogous connections with the doorsand windows of the building to be protected.

In practice, when the wires 12 are con nected with the doors andwindows, the springs 8 are distended and remain distended as long as thedoors and windows are closed and in this condition of the springs theframe 6 may be slid within the guide tubes 5 to engage the finger 7 withthe tapper 3, thereby holding the latter against operation. When,however, one of the doors or windows is opened the particular springconnected with such door or window reacts and the hooked end of thespring engages the adjacent end bar of the frame 6 and slides the latterwithin the guide tube 5, thereby disengaging the finger 7 from thetapper 3 so that the tapper may be operated by the spring motor a tosound the bell and so warn the occupants of the premises of theattempted entrance to the building. Secured to the baseboard 1 arescrews 13 disposed adjacent to the hooked ends of the springs and thesescrews are adapted to receive the rings 11 when it is desired to renderthe alarm apparatus inactive and as long as the rings are in engagementwith the screws 13 the springs are held distended and the linger 7permitted to hold the tapper against operation.

I claim:

In burglar alarm apparatus, a baseboard, a bell secured to saidbaseboard, a spring operated tapper adapted to sound said bell, guidetubes secured to said baseboard and spaced apart in parallelism, asubstantially rectangular frame having the side bars thereof slidablymounted within said tubes,

a finger carried by one end bar of said frame and adapted to engage saidtapper to hold the latter normally against operation, springs mountedupon said baseboard and confined within the space defined by said aframe and having the inner ends thereof secured to said frame and theouter ends formed to provide hooks encircling the other end bar of saidframe, rings connected to the hook ends of said springs and wiresconnected to said rings and secured to the doors, and windowsrespectively of the protected structure and adapted to hold the springsnormally under tension and to release said springs when the doors andWin doWs are opened whereby the springs will Copiesof this patent may beobtained for be permitted to react to engage the hook ends thereof withthe adjacent end bar of said frame to slide the latter in said guidetubes to release said tapper.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

